Chain saw



FIG. 1 is a front perspective view of the chain saw showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a reference perspective view thereof.

The broken lines represent the portions of the design that form no part of the claim. 

CLAIM The ornamental design for chain saw, as shown and described. 